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RMT Ltd. Joint Stock Company Optical Unit DX6006 Series User Guide DX6006 RMT Ltd. Edition November 1998 Copyright All right reserved. Reproduction in any manner, in whole or in part is straightly prohibited without written permission of RMT Ltd The information contained in this document is subject to change without notice. Limited Warranty RMT Ltd. warrants that DX6006 Optical Units, if properly used and installed, will be free from defects in material and workmanship and will substantially conform to RMT’s publicly available specification for a period of one (1) year after date of DX6006 Optical Unit was purchased (whatever purchased separately or as a part of gas analyzer system). If the DX6006 Optical Unit which is the subject of this Limited Warranty fails during the warranty period for the reasons covered by this Limited Warranty, RMT, at this option, will : REPAIR the DX6006 Optical Unit; OR REPLACE the DX6006 Optical Unit with another DX6006 Optical Unit. Trademark Acknowledgments All trademarks are the property of their respective owners RMT Ltd. Leninskij prosp. 53, Moscow 117924 Russia phone: 095-132-6817 fax: 095-135-0565 e-mail: [email protected] http://www.rmtltd.ru REV. 1.0/98 RMT Ltd. DX6006 Contents 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Introduction..................................................... Principles of Operation.................................... Operation Overview......................................... Optical-Mechanical Design.............................. Dimensions...................................................... Calibration....................................................... Re-Calibration.................................................. Zero Adjustments............................................. Part Number Designations .............................. Electronics, Functional Diagram...................... Light Emitter................................................ Preamplifiers.............................................. Thermoelectric Coolers............................... Thermistors.. ........................................... E2PROM..................................................... 11. Instalation Tips................................................. 12. Standard Kit................................................... REV.1.0/98 3-3 4-4 4-5 6-6 7-7 8-9 10-10 11-11 12-12 13-17 18-19 20-22 23-25 26-27 28-31 32-33 34-34 1 DX6006 RMT Ltd. Introduction Company RMT Ltd. introduces new series of optical units DX6006 suitable for designing of portable gas analyzers. They are the key parts of optical gas analyzers. The principle of operation is based on selective absorption of IR emission by gas molecules. Dx6006 Optical Unit contains of gas sampling cell, optoelectornic coordinated pair of light emitter and detector, and electronic PCB for output signal pre-amplification and driving by optoelectronic components. The differential double frequency optical scheme provides high accuracy in wide range of humidity and wide temperature range due to internal thermostabilization. New types of middle infrared light emitters and photodetectors with built-in thermoelectric cooling are used. There are several models suitable for the following gases : CO2, Advantages ü ü ü ü high selectivity and stability, wide range of measured, concentrations, the long service life. Features ü ü ü REV.1.0/98 no moving parts, minimum dimensions and light weight, minimum power consumption. 3 DX6006 RMT Ltd. Principles of Operation The DX6006 is based on Non-Dispersive Infra-Red Spectroscopy (NDIR). Classical double channel scheme is realized. Intensities of two light beams, passed through measuring gas sampling cell, are compared. One of the beams (measuring channel) has the wavelength which is tuned to optical absorption line of measured gas. The other one (reference channel) server for control and it's wavelength maximum lies out from the absorption line. According to fundamental low, light absorption in gas volume is proportional to absorbing gas concentration : I = I o × exp( −α × L × X ), where Io , I - intensities of light before and after gas volume pass; α - absorption coefficient of the gas at chosen light wavelength; L - optical pass length; X - gas concentration. At fixed L and known absorption (α) it is possible to find gas concentration using measurement of intensity of light (measuring channel) from light emitter passed to photodetector. Reference channel used for indirect measuring of initial intensity of light and allows to eliminate actual measurements conditions Operation Overview The DX6006 optical unit is specially designed for fast response, high sensitivity, low noise and low power consumption gas analyzer designing. A number of design features contribute to the performance : s The infrared source is a special pulsed light emitter which operates in microsecond range. s The light source has long life (> 10000 hours) and assembled with built-in miniature TE coolers for its thermostabilization. 4 REV. 1.0/98 DX6006 RMT Ltd. s s s s s Intensity s Radiation from light emitter is passed through gas sampling cell, reflects from spherical mirror and focused onto dual element photodetector. Both sensitive elements of the detector are similar. First one (measuring channel) is covered by miniature narrow band (0.02 µm) optical filter tuned to absorption line of measured gas. Second one also has built-in narrow-band filter, but its wavelength lies out from absorption of the gas. Both sensitive elements and its filters are placed onto miniature built-in thermoelectric cooler. The detector can o be cooled and regulated down to -20 C. Heat dissipated from warm side of TE coolers of light emitter and detector leads to few degrees of overheating of gas cell above ambient. This factor plays the role of vapor anti-condensation at operation in wet conditions. Light emitter and detector are mounted at miniature PCB. It provides optoelectronic components driving and output Intensity s λ1 λ2 Wavelength Photoresistor Filters Gas Flow Light Emitter REV.1.0/98 λ 1 λ2 Wavelength 5 DX6006 RMT Ltd. Optical-Mechanical Design The Optical Unit is designed as integrated device. It consists of isolated double pass gas sampling cell (spherical mirror and sapphire window are placed at the end sides) and opto-pair with electronic module (miniature PCB) with output connector. Gas sampling cell has four gas inlets. For standard deliveries two of four gas inlets are closed, but other ones have gas inputs pipes with 4.2 mm internal diameter. Gas sampling cell could be easily disassembled for service of internal optics (mirror and window). For this purpose the cover cap of mirror is opened and mirror could be removed. The mirror has special SiO2 safety layer. At the back side of the optical units another aluminum cap covers electronic module. This cap has four holes for mounting of the Optical Cell. It is possible to remove the cap. 6 LE PR2 t Ligh Connector PCB PR1 Mirror Gas Light Emitter Dual element photodetector REV. 1.0/98 DX6006 RMT Ltd. Dia. 35.4 mm Dimensions ia D .6 m m 57 mm 15 4 holes M2.5 20 1 15 2 mm Mark Connector s Aspiration and Diffusion sampling modes are available, s In standard option the Optical Units are made from anodized aluminum. Stainless steel option is available on request. REV.1.0/98 7 DX6006 RMT Ltd. Calibration The Photodetector output signal is non-linear with respect to measuring gas concentration. In spite of theoretical formula, a light intensity, passed through gas cell, is the integral of various optical rays from Light Emitter. Moreover sensitivity of Photodetector and performance of Light Emitter depend very from its operating temperatures. Thus, every DX6006 Optical Unit is provided by individual calibration. The first calibration is made by manufacturer. The factory standard calibration uses not less than 5 reference gases with concentrations within specified measuring range. The polynomial formula is used: X = A3 × Y 3 + A2 × Y 2 + A1 × Y + A0 D Y= 0 D D= Um Ur where X - gas concentration [ppm], À3…A0 - polynomial coefficients; Um, Ur - outputs of measuring and reference channels; D0 - "zero" ratio at zero concentration of measured gas. Calibration results are attached to specifications of DX6006 optical unit. Also the calibration data is stored in on-board 2 E PROM memory chip. The calibration data is presented as : T [K x 10] - operating temperature of Light Emitter and Photodetectors kept by built-in TE coolers.(they are the same for both emitter and detector); 8 REV. 1.0/98 DX6006 RMT Ltd. Òà D0 A3...A0 [K x 10] - ambient temperature ( is valid for operation of DX6006 Optical Units with RMT's Electronic Controller Module DX6001) [ ] - “zero” ratio [ ] - polynomial coefficients. 2 Gas Concentration, ppm Format of calibration data stored in E PROM memory chip is described below in "E2PROM" Chapter. 5.0% 4.0% 3.0% 2.0% 1.0% 0.0% 1.0 1.5 2.0 2.5 3.0 3.5 D0/D Ratio The actual calibration of a typical DX6006 : D0/D is the ratio of measuring -to-reference channel outputs (Um/Ur) at zero (D0) and fixed (D) concentrations, correspondingly. REV.1.0/98 9 DX6006 RMT Ltd. Re-Calibration In standard option DX6006 Optical Unit is delivered with one calibration data. The calibration is made at optimal operating temperature. User can make re-calibration in any time. It is possible to do this at other operation temperatures, with larger set of reference gases (larger order polynomial) and to replace stored data by new one. According to customer demands the re-calibration could done by manufacturer on request. On-board memory have additionally 4 data block for more calibrations - totally up to 5 different calibrations. The polynomial coefficients Aj depend on design of Optical Unit’s optical scheme. It is not necessary to make re-calibration often. 10 REV. 1.0/98 RMT Ltd. DX6006 Zero Adjustments To ensure the high accuracy, simple adjustment can be made during operation to adjust Optical Units' ‘zero’. The zero parameter D0 should be periodically set by flowing through Optical Unit gas with zero concentration. For instance, nitrogen, argon and so on. REV.1.0/98 11 DX6006 RMT Ltd. Part Number Designations DX6006-XX-XXX-X-X-X-XX-XX Part Number Electronic Scheme Code Gas Code Gas 01 CO2 02 CnHm 03 CH4 04 CO 05 H2O Opto-Mechanical Modification (Not for specifying in Order Form) (Not for specifying in Order Form) Operating Temperature Concentration Range In ppm, Includes two significant digits of the concentration value followed by the number of zeros to follow Code Gas 1 +10 to +45 °C −10 to +45 °C 2 Heat sink option 0 - standard 1 - optional Gas Sampling Option A - Aspiration D - Diffusion An example: DX6006-03-A-504-0-1-02-50-02-41 [DX6006] [-03] Optical Unit for CH4 concentration measuring, [-504] [-A] [-0] [-1] 0...5.0⋅104 ppm (0...5% vol) concentration range, aspiration option, without additional heat sink, for operation within +10 to +45 °C temperature range, opto-mechanical modification #02, [-02] 12 REV. 1.0/98 DX6006 RMT Ltd. Electronics, Functional Diagram DX6006 Optical Unit is supplied by electronic module (PCB). Two modifications are available: DX6006-4.10 and DX6006-5.00. It is connected with some differences of optoelectronic components required for different gases and measuring parameters. Optical Unit DX6006-01 DX6006-02 DX6006-03 DX6006-04 DX6006-05 Gas (CO2) (CnHm) (CH4) (CO) (H2O) Module DX6006-4.10 DX6006-4.10 DX6006-4.10 DX6006-5.00 DX6006-4.10 Functional Diagram is presented in Fig. EF-1. Differences are connected with some functionality of preamplifiers and absence of pin TC1 and pin TC2 in output connector in model DX6006-5.00. Darken areas at electronic module’s scheme mark internal parts of Light Emitter and Detector. Output numbering coincides with numbers of connector pins. The main functions of electronic modules are as following: power supply of optoelectronic components, pre-amplification of output signals of measuring and reference channels of Detector, driving by Light Emitter, switching off TE coolers (only for version 4.10), storage of operating and individual calibration data of Optical Unit. Six pins are used for power driving of Optical Unit: power input +5 V for pre-amplifiers and precise 4.096 V reference (pin 2), “Ground” of measuring part of electronics (1), power part’s “Ground” (15), REV.1.0/98 13 DX6006 RMT Ltd. power supply of light emitter (6), power supply of TE coolers of Llight Emitter (7), power supply of TE cooler of Photodetector (9). Emitter Pin 6 Pin 13 Pin 15 Pin 8 Pin 7 t° (DX6006-4.10 only) Pin 14 Pin 15 Detector Pin 1 4.096 V precision voltage reference +5 V Pin 2 Pin 3 Pin 4 Pin 9 t° (DX6006-4.10 only) Pin 12 Pin 15 Pin 5 E2PROM Pin 10 Pin 11 Fig. EF-1 DX6006-4.10/DX6006-5.00 Functional Diagram 14 REV. 1.0/98 DX6006 RMT Ltd. Pre-amplifiers of measuring and reference channels are similar. Amplification coefficient is 21. Reference channel output is connecter to pin 4, measuring one - pin 3. The power MOSFET switch is used to drive by Light Emitter (connector pin 13). In 4.10 type both TE coolers of Light Emitter and Photodetector could be disabled through pin 14 and pin 12, correspondingly. The sensitive elements of Detector and Thermistors supplied by precise 4.096 V reference. Load resistors’ (serial to thermistor) nominals optimized for maximal linearity and sensitivity in operation temperature range of optoelectronic components. The outputs of Light Emitter’s thermistor and Detector’s one are contacted to pins 8 and 5, correspondingly. Identification and operation parameters of optical unit are stored 2 into on-board E PROM memory (16 Kb). The data are available through pin 10 and pin 11 in full accordance with standard interface I2C™. Legend t° - TE cooler - MOSFET switch - thermistor - amplifier - LED I2C™ is a Trademark of Philips Corp. REV.1.0/98 15 DX6006 RMT Ltd. 1 3 2 + 4 12 t° 11 5 10 6 9 8 7 +5 V U2 1 1 15 3 4 5 9 10 11 12 15 2 6 7 8 SCL SDA X1 X1 13 14 U1 +4.096 V 10 11 12 1 Measure t° 8 Reference 9 7 5 4 DX6006-4.10 pin function description Pin Mnemonic 16 2 3 6 Fig. EF-2 DX6006-4.10 Optical Unit pinouts (Controller connection side view) + 01 GNDA 02 03 04 05 06 07 08 09 +5V OUT OUTREF TR1 ELED ETC2 TR2 ETC1 10 SCL 11 12 SDA TC1 13 14 15 LED TC2 GNDP Description Ground reference point for analog circuitry and E2PROM Optical Unit supply voltage Measuring channel output Reference channel output Thermistor of photodetectors LED power supply LED’s cooler power supply Thermistor of LED Photodetector’s cooler power supply I2C interface. Synchronization line I2C interface. Data line Photodetector’s cooler enable transistor LED enable transistor LED’s cooler enable transistor Ground reference point for power circuitry REV. 1.0/98 DX6006 RMT Ltd. DX6006-5.00 pin function description Pin Mnemonic 01 GNDA 02 03 04 05 06 07 08 09 +5V OUT OUTREF TR1 ELED ETC2 TR2 ETC1 10 SCL 11 12 13 14 15 SDA LED GNDP Description Ground reference point for analog circuitry and E2PROM Optical Unit supply voltage Measuring channel output Reference channel output Thermistor of photodetectors LED power supply LED’s cooler power supply Thermistor of LED Photodetectors cooler power supply I2C interface. Synchronization line I2C interface. Data line - Not connected LED enable transistor - Not connected Ground reference point for power circuitry 1 3 2 + 4 12 t° 11 5 10 6 9 8 7 +5 V U2 1 1 15 3 4 5 9 10 11 12 15 2 6 7 8 SCL SDA X1 X1 13 14 8R U1 11 12 1 Measure Reference 8 t° +4.096 V 10 9 7 + 2 3 6 5 4 Fig. EF-3 DX6006-5.00 Optical Unit pinouts (Controller connection side view) REV.1.0/98 17 DX6006 RMT Ltd. Light Emitter Electronics Scheme ( Fig. LE-1.) for driving by of Light Emitter + RL provides stable current pulses up to 5 A through the Emitter with duration of 50…100 µsec. The MOSFET transistor is used as switch key which is driven by TTL logic signals. 13 The resistor RG in gate circuit RG fixes closed state of transistor at 15 absence of activity from external electronic scheme. Fig LE-1 LED drive switch Loading Resistor RL (1 Ohm) limits and stabilize T = +25°C current through light emitter. 5 The typical volt-ampere plot of the Light Emitter is presented at Fig. LE-2. 4 Darken area means technological deviations of Light Emitter performance. 3 According to the Fig. LE-2 at RL=1 Ohm typical pulsed 2.4 current is about 1.8 A 2 1.8 (1.4…2.4 A). 1.4 Capacitor C together with other external capacitors,, 1 works for accumulation of pulse energy for light emitter. 0 2 4 6 Typical recommended ULED, V schematics for driving by Load line corresponds U=5V the Light Emitter is R = 1 Ohm to following conditions: L presented at Fig. LE-4. Fig. LE-2 Power Supply 5 V (+4…+6 V are available) through resistor R charges capacitor C in time 6 ILED, A C 18 REV. 1.0/98 DX6006 RMT Ltd. duration between pulses. Total capacity (capacitor C and available external ones) must be enough for pulse current stability (Fig. LE-3) within ILED, A Fig. LE-3 Typical current pulse shape through Light Emitter ∆I 2 1 0 10 30 50 70 T, µsec Light Emitter Specifications T = +20°C Parameter Units Min Nom Max Comments 4.5 0.2 4 5.5 Q = 200, t = 100 µs I=4A +12 4 Pin. 13 At +4.5 V - pin 13 1.5 Pins. 3 and 4 Electrical Parameters Light emitter CW Current Pulse Current Direct Voltage Drop A A V Switch Key Operating voltage Resistance V mOhm Resistor Nominal Ohm -12 0.95 1.0 Dynamical Parameters Time Constant Optical Unit µs R pin 6 + + Pin 13 C ON/OFF Pin 15 +5 V Linear Voltage Regulator +E Microcontroller GND Fig. LE-4 Typical LED control circuit REV.1.0/98 19 DX6006 RMT Ltd. Preamplifiers The pre-amplifiers’ (measuring and reference channels) schematics is presented at Fig. PA-1 and PA-2. The both channels are identical. There are only difference in components nominals, because some difference of sensitive elements of measuring and reference channels. Every preamplifier is a half part of 2 dual Op Amp. Amplification coefficient is 21 without signal inversion. 4 Load resistors nominals are optimized for coordination with resistivity of sensitive elements (at 3 operating temperature range). Typical (recommended) outside schematics is Fig. PA-1. Pre-amplifiers of DX6006-4.10 Amplifiers specifications T = +20°C; ÅÏ = 5 V ±5% Parameter Units Min V mA mA 4 Nom Max Comments Electrical parameters Pre-Amplifiers Operating voltage Operating Current Output current 6 1.45 +3 -3 Pin. 2 Pin. 2 Pin. 3,4 Dinamical Parameters Rice Time Foult Time 20 µs µs 15 15 Pin. 3,4 Pin. 3,4 REV. 1.0/98 DX6006 RMT Ltd. placed in Fig. PA-1. 2 Warning. In designing of external electronics it is necessary to note that 4 output signals of pre+ amplifiers are referenced to “ground’ rail (Fig. PA4). This means that if to use unipolar external amplifiers, then they must have Rail-to-Rail input. 3 Moreover it is necessary + to take into account that output signal of measuring channel in dependance of gas concentration should be changing within orders of value. To Fig. PA-2 Pre-amplifiers of DX6006-5.00 preserve accuracy at large measuring gas concentrations it is necessary to use external amplifier of measuring output with variable amplification coefficient. It is to co-ordinate the amplified signal with an ADC range. UIOUT, mV 200 100 0 T, 20 µsec/div Fig. PA-3 Typical pulse at pre-amplifiers’ outputs REV.1.0/98 21 DX6006 RMT Ltd. Gas cell Pin 2 Pin 4 ADC Pin 3 ADC Pin 1 Fig. PA-4 Typical amplifier usage circuit Output (mV) 250 1.40 1.20 200 Um/Ur Um 150 1.00 Ur 0.80 100 0.60 50 0.40 0 0.20 -20 -15 -10 -5 0 5 10 15 20 o Temperature ( C) Fig. PA-5 Preamplifier Output vs Operation Temperature 22 REV. 1.0/98 RMT Ltd. DX6006 Thermoelectric Coolers Driving by TE coolers 9 (7) requires particular attention. First of all, the operation of TE coolers directly affect on performance 12 (14) parameters of Optical Units and gas sensors based on them. 15 At the second, the TE coolers are the components which Fig. TE-1 Schematics of TE coolers in 6006-4.10 module consume largest part of power (Fig. TE-3). Output signal of Photodetector 9 (7) depends very from their temperature (Fig. PA-5). This ratio is approximately 100%/20 o C. It is equivalent to temperature drift 1%/0.2 oC. It means that if the thermo-stabilization should be with 15 accuracy of 0.1 deg, then accuracy of measurements will be 0.5%. Accuracy of thermo-stabilization Fig. TE-2 Schematics of TE must be not less than required for coolers in 6006-5.00 module gas sensing. Operating temperature of TE coolers must be selected optimal (from Fig. PA-5 and Fig. TE-3): too lower temperature stabilization leads to higher power consumption; at higher temperature the output signals (and signal/noise ration) are lower. The Optical Unit housing has been designed for additional heat dissipation from warm side of working TE coolers. Maximal heat dissipation is 2 W. At Ta - Top> 40 oC it is necessary to use additional heat dissipation - bigger heat sink (optional available) or fan. REV.1.0/98 23 DX6006 RMT Ltd. In a custom made algorithm of thermo-stabilization it has to be taken into account that time constant of TE cooler is approximately 2 s. Electronic Scheme of TE cooling in DX6006-4.10 and DX60065.00 are presented at Fig. TE-1 and Fig. TE-2, correspondingly. An example of recommended scheme of thermo-stabilization is presented at Fig. TE-4 and TE-5. TE Cooling Specifications Tam = +20°C; Å = 5±5% V, unless otherwise noted Parameter Units Electrical parameters TE coolers Operating ∆T Operating Voltage Operating Current Resistivity Min Switch key Switching voltage Resistivity Max 6.9 4.3 0.4 7.1 1 kHz, at +30°C, +12 80 Pin. 12 (14) At +4.5 V to pin. 12 (14) 10 10 At ITC = 0 -> ITC = 0.4 À At ITC = 1 À -> ITC = 0 -40 °C V A Ohm 6.7 -12 V mOhm Comments Nom Dynamical parameters Time Constant Time Constant ñ ñ Power (Watts) 2.0 1.5 1.0 0.5 0.0 -20 -15 -10 -5 0 5 10 o Temperature ( C) Fig. TE-3 TEC Power Consumption vs Operation Temperature 24 REV. 1.0/98 DX6006 RMT Ltd. Optical Unit Pin 9 (7) +E + TC + Pin 12 (14) ON/OFF PWM Microcontroller Pin 15 GND Fig. TE-4 Typical TEC control circuit for DX6006-4.10 Module. Optical Unit Pin 9 (7) +E + + TC PWM Microcontroller Pin 15 GND Fig. TE-5 Typical TEC control circuit for DX6006-5.00 Module. REV.1.0/98 25 DX6006 RMT Ltd. Thermistors UREF t° t° RT 5 8 UTR RL Fig. TR-1 Thermistors connection in DX6006 module For temperature driving by TE coolers, NTC thermistors built-into cold side of TE coolers are used. These thermistors are applied in scheme with serial loading resistor RL and reference power supply Uref (Fig. TR-1). Output signal from the thermistor scheme depends on its resistivity which change with temperature as : RL UTR = UREF RL + R T Thermistor Output (V) One can see that temperature measurement accuracy depends directly from Uref. In electronic PCB of Optical Unit is used 4.096 V Precise Voltage Reference. Typical dependence of thermistor's scheme output vs measured temperature is presented in Fig. TR-2. Recommended external schematics is presented at Fig. TR-3. At least 12-bit resolution ADCs are recommended to apply. 3.5 3.0 2.5 2.0 1.5 1.0 30 25 20 15 10 5 0 -5 -10 -15 -20 o Temperature ( C) Figure TR-2 Thermistor’s circuit Output vs Measuring Temperature 26 REV. 1.0/98 DX6006 RMT Ltd. Thermistors Specifications T = +20°C; EÏ = 5 V ±5% Parameter Resistivity Beta-Constant Units Min Nom Max kOhm K·10-3 2.09 2.9 2.2 3.1 2.31 3.5 Comments at 20 oC Optical Unit t° t° Pin 5 ADC Pin 8 ADC Fig. TR-3 Typical thermistor usage REV.1.0/98 27 DX6006 RMT Ltd. E2PROM The standard Electrically Erasable PROM (E2PROM) 24C164 chip is placed in Optical Unit's PCB. It is used to storage 2 Fig. EP-1 I C interface connection of identification code of Optical Unit, calibration data and some additional data for operation of the unit. Additional data are used for operation of the Optical Units with manufacturer's controller DX6001. Without power supply the data are stored not less than 10 years. Pin 10 Pin 11 E2PROM E2PROM Specification Parameter Value Volume, bit Number of re-writing cycles, not less 16 K (2K×8) 10⋅106 Write speed, µs 10 At Fig. EP-2 is presented recommended schematics for usage of the E2PROM with outside controlled using I2C interface. The detailed information on I2C interface is possible to retrieve from technical data of Microchip Corporation (http://www.microchip.com). Optical Unit E PROM Pin 10 +5V 1 kΩ Pin 11 2 1 kΩ + SDA SCL Microcontroller Fig. EP-2 On-board Memory usage 28 REV. 1.0/98 DX6006 RMT Ltd. E2PROM Data Format Various operating parameters are stored in on-board E2PROM circuit: calibration data, synchronization parameters, measuring mode presets, TE cooling algorithm presets, Optical Unit identification. The E2PROM usage structure is placed in Table EP-1. Detailed description of usage of all data stored in memory are in User Manual for DX6001 Controller of RMT Ltd. It was designed for optimal operation with DX6006 Optical Units. 2 E PROM Memory Structure Address Item (hex) 1 2 3 4 5 6 7 8 9 10 0000 0018 0030 0048 0060 0078 0082 008C 0096 00A0 Content Calibration data block (first calibration data) Calibration data block Calibration data block Calibration data block Calibration data block Block of synchronization parameters* Block of parameters of measuring cycle* Parameters of thermostabilization of Detector* Parameters of thermostabilization of Light Emitter* Optical Unit Identifier Table EP-1 Command fn 0 fn 1 fn 2 fn 3 fn 4 hw jb pr em id * - are used only with DX6001 Controller REV.1.0/98 29 DX6006 RMT Ltd. Format of First Calibration Data Block Address Item (hex) Description Name Units Format t tenv K0 unit unit - int16 int16 float 1 2 3 0000 0002 0004 TE coolers Operating Temperature Ambient Temperature of Calibration “Zero” Value 4 0008 Polynomial Coefficient A3 a3 - float 5 0014 Polynomial Coefficient A2 a2 - float 6 0020 Polynomial Coefficient A1 a1 - float 7 0024 Polynomial Coefficient A0 a0 - float Formats of another reserved (if applied) Calibration Data Blocks are the same as the first one. 30 REV. 1.0/98 DX6006 RMT Ltd. Identifier Data Format Identification Data is written as ASCI string. It contains the following information: Serial Number Electronic Scheme Code Concentration Range In ppm, Includes two significant digits of the concentration value () followed by the number of zeros to follow. Gas Code Code Gas 01 CO2 02 CnHm 03 CH4 04 CO 05 H2O Part Number Gas Designator 6 positions max, followed by space symbol Example: CO2 6006.01.504.41-0012 [CO2] [6006] [01] “CO2” DX6006 Series CO2 Gas Option, [504] [41] 0...5.0⋅104 ppm (0...5%) concentration range, electronic scheme revision #4.10, REV.1.0/98 31 DX6006 RMT Ltd. Installation Tips It is required an external DC Power Supply with +5 V ±5% and operating current not less than 7.5 mA. Power Supply is to be connected to pin 2. It is used for supply of: pre-amplifiers of Photodetector, thermistors and sensitive elements of Photodetector, E2PROM. Power Supply for customer external electronics depends of scheme concepts. It is necessary to note only that total current consumption of Light Emitter and TE Coolers of DX6006 Optical Unit is not more than 300 mA, if operating temperature of TE o coolers is preset as 0...-5 C (recommended) . Optical Unit +5V +6…9.5 V Linear Regulator Pin 2 … … Pin 6 Pin 7 Pin 9 Pin 1 Pin 15 Control & Measuring Circuits Power supply 0 LED & TE Coolers Drivers Signal Ground Power Ground Shielding Ground Fig. IT-1 DX6006 Power Supply connecting Recommended connection is presented at Fig. IT-1. 32 REV. 1.0/98 RMT Ltd. DX6006 The most important thing is - power circuit part and measuring circuit must be separated and have coupled “Ground” close to power supply. Shielding “Ground” must contact Optical Unit housing with (Fig. IT-1), customer electronics with using optional cable DX6000-C05. REV.1.0/98 33 DX6006 RMT Ltd. Standard Kit Standard Kit of DX6006 consists of : 1. 2. 3. 4. 5. 34 Optical Unit DX6006 Interface cable for 15 pins Connector 15 pins Connector (female) User Manual Specification 1 pc. 1 pc 1 pc 1 booklet 1 REV. 1.0/98 RMT Ltd. Leninskij prosp. 53, Moscow 117924 Russia phone: 095-132-6817 fax: 095-135-0565 e-mail: [email protected] http://www.rmtltd.ru REV.1.0/98 35